山姆代购成潮流，为啥实体店还需要弄代购？

Group 1 - The rise of Sam's Club purchasing agents has become a trend, particularly in lower-tier cities, with various types of stores emerging that sell similar products to those found in Sam's Club [3][6] - These purchasing agents, referred to as "Sam's sub-agents," are capitalizing on the demand for high-quality products in lower-tier markets, where traditional Sam's Club locations are scarce [4][6] - The emergence of these stores is driven by the increasing purchasing power and demand for quality goods among consumers in third and fourth-tier cities [6][8] Group 2 - The purchasing agent model serves as a bridge for consumers in lower-tier cities to access products from high-end retail stores like Sam's Club, which are primarily located in first and second-tier cities [6][8] - The economic principle of arbitrage is at play, as purchasing agents exploit price differences between markets, purchasing products in bulk from Sam's Club and reselling them at a markup in lower-tier cities [9] - The sustainability of this purchasing agent model may be challenged if major retailers like Sam's Club expand their presence in lower-tier markets, potentially reducing the need for such services [11]